Browse files and dirs in the JAR-file

Question

Hi! I'm stuck with a problem concerning browsing a JAR file to find all images, fonts and sound clips. I think this is a pretty straight-forward task, except when I consider that the file I want to browse, is the same file the browser is stored in and running from. I have searched for hours on the internet now, and I still haven't figured out a way to be able to browse my JAR file.
Here is the code I use when I'm not running my project in a JAR-file:
     * Load and cache all files (*.ttf, *.png and *.wav) from the resource-directory
    public void loadResources() throws FileNotFoundException {
        // log available VRAM
        log.println("Available VRAM before loading resources: " + graphicsDevice.getAvailableAcceleratedMemory() + " bytes", Log.INIT);
        // determine whether or not we are dealing with the contents of a jar-file
        jar = getClass().getResource("").getProtocol().startsWith("jar");
        // browse all directories
        long start, end;
        int loadTime = -1;
        start = System.nanoTime();
        browseDirectory(".." + separator + "resources");
        end = System.nanoTime();
        loadTime = Math.abs((int)(end - start) / 1000000);
        resourcesLoaded = true;
        // log
        log.println("Resources loaded in " + loadTime + " ms", Log.INIT);
        // log available VRAM
        log.println("Available VRAM after loading resources: " + graphicsDevice.getAvailableAcceleratedMemory() + " bytes", Log.INIT);
     * Browse a directory and load and cache all it's files
     * @param path The directory to browse
    private void browseDirectory(String path) {
        // log
        log.println("Browsing directory: " + path.replaceFirst("\\W*", ""), Log.INIT);
        try {
            if (jar) {
                // TODO: enable JAR-browsing by getting the input stream from the JAR-file, then browse through all entries
                throw new RuntimeException("Cannot browse JAR-files yet!");
            else {
                File dir = new File(getClass().getResource(path).toURI());
                // browse through the directory
                String[] files = dir.list();
                File file;
                for (String name: files) {
                    file = new File(dir.getAbsolutePath() + separator + name);
                    // if this is a new sub-directory, browse it
                    if (file.isDirectory()) browseDirectory(path + separator + file.getName());
                    // otherwise, add the file
                    else addFile(path, name);
        catch (Exception e) { e.printStackTrace(); }
    } But, as you may see, I need a similar code to browse the JAR-file....please help me!
lhk

Answer 1

I worked it out by trying and failing:
      * Browse the JAR-file and load all it's relevant files
     private void browseJar() {
          try {
               // convert the resource directory path to a JAR-compatible path
               String jarDir = dir.replaceAll("\\" + separator, String.valueOf(jarSeparator));
               // get the jar-file and it's entries
               Enumeration<JarEntry> entries = new JarFile(new File(getClass().getProtectionDomain().getCodeSource().getLocation().toURI())).entries();
               // browse the contents of the file
               JarEntry entry;
               int nameIndex;
               String name = null;
               String path = null;
               while (entries.hasMoreElements()) {
                    // get the entry
                    entry = entries.nextElement();
                    // we only process relevant entries
                    if (entry.getName().startsWith(jarDir)) {
                         nameIndex = entry.getName().lastIndexOf(jarSeparator);
                         name = entry.getName().substring(nameIndex + 1);
                         // if we find a new directory, we get it's path
                         if (entry.isDirectory()) {
                              path = entry.getName().substring(jarDir.length(), nameIndex);
                              if (path.startsWith(String.valueOf(jarSeparator))) path = path.substring(1) + jarSeparator;
                              // log (the system-compatible path)
                              log.println("Browsing directory: " + dir + separator + path.replaceAll(String.valueOf(jarSeparator), "\\" + separator), Log.INIT);
                         // otherwise, we add the resource
                         else addFile(path, name);
          catch (Exception e) { e.printStackTrace(); }
     }As may be seen in the code, I discovered that the regular file separator could not be used in jar paths, which I found strange. I tried a lot to make the regular separator work, but couldn't manage it. Anyway, this code works for me.